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87 lines
2.5 KiB
C
87 lines
2.5 KiB
C
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/* Copyright (C) 1991, 1992 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If
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not, write to the Free Software Foundation, Inc., 675 Mass Ave,
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Cambridge, MA 02139, USA. */
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#include <ansidecl.h>
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#include <stddef.h>
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#include <stdarg.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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/* Enlarge STREAM's buffer. */
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static void
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DEFUN(enlarge_buffer, (stream, c),
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register FILE *stream AND int c)
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{
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ptrdiff_t bufp_offset = stream->__bufp - stream->__buffer;
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char *newbuf;
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stream->__bufsize += 100;
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newbuf = (char *) realloc ((PTR) stream->__buffer, stream->__bufsize);
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if (newbuf == NULL)
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{
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free ((PTR) stream->__buffer);
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stream->__buffer = stream->__bufp
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= stream->__put_limit = stream->__get_limit = NULL;
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stream->__error = 1;
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}
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else
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{
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stream->__buffer = newbuf;
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stream->__bufp = stream->__buffer + bufp_offset;
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stream->__get_limit = stream->__put_limit;
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stream->__put_limit = stream->__buffer + stream->__bufsize;
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if (c != EOF)
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*stream->__bufp++ = (unsigned char) c;
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}
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}
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/* Write formatted output from FORMAT to a string which is
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allocated with malloc and stored in *STRING_PTR. */
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int
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DEFUN(vasprintf, (string_ptr, format, args),
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char **string_ptr AND CONST char *format AND va_list args)
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{
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FILE f;
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int done;
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memset ((PTR) &f, 0, sizeof (f));
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f.__magic = _IOMAGIC;
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f.__bufsize = 100;
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f.__buffer = (char *) malloc (f.__bufsize);
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if (f.__buffer == NULL)
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return -1;
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f.__bufp = f.__buffer;
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f.__put_limit = f.__buffer + f.__bufsize;
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f.__mode.__write = 1;
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f.__room_funcs.__output = enlarge_buffer;
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f.__seen = 1;
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done = vfprintf (&f, format, args);
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if (done < 0)
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return done;
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*string_ptr = realloc (f.__buffer, (f.__bufp - f.__buffer) + 1);
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if (*string_ptr == NULL)
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*string_ptr = f.__buffer;
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(*string_ptr)[f.__bufp - f.__buffer] = '\0';
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return done;
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}
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